KR102642615B1 - Organic light emitting diode display device - Google Patents

Abstract

The present invention is intended to minimize overheating of an organic light emitting diode display device by controlling the current supplied to the panel based on the current information supplied to the panel, and includes a panel on which a plurality of pixels are arranged, a power supply unit that supplies current to the panel, And a control unit that obtains information on the current supplied to the panel and performs automatic current limit to control the current supplied to the panel below a preset current limit value, and the control unit provides information on the current supplied to the panel. Based on this, the current limit value can be adjusted.

Description

Organic light emitting diode display device {ORGANIC LIGHT EMITTING DIODE DISPLAY DEVICE}

The present invention relates to an organic light emitting diode display device, and more specifically, to reducing the temperature of an organic light emitting diode display device.

Recently, the types of display devices have become more diverse. Among them, organic light emitting diode displays (hereinafter referred to as OLED displays) are widely used.

Since OLED displays are self-luminous devices, they have the advantage of low power consumption and can be manufactured thinly compared to liquid crystal displays that require a backlight. Additionally, OLED display devices have the advantage of a wide viewing angle and fast response speed.

A typical OLED display device consists of red, green, and blue sub-pixels to form one pixel, and displays images in various colors through three sub-pixels. It can be displayed.

Specifically, an OLED display device can display an image by supplying current to at least one of red, green, and blue subpixels. For example, an OLED display device can reproduce red in that pixel by supplying current only to the red subpixel and not supplying current to the green and blue subpixels. In addition, the OLED display device can reproduce secondary colors such as yellow, cyan, and magenta by supplying current to two of the red, green, and blue subpixels. You can.

OLED display devices can supply high current to the panel when displaying images containing many secondary colors, such as animation, or when setting the image mode to vivid mode. In this case, the temperature of the panel may become excessive. Escalating problems may occur.

As a prior art to prevent overheating of the OLED display device, Republic of Korea Patent Publication No. 10-0680913 (announced on February 8, 2007) uses a temperature sensor to measure heat generated from the OLED display device and input it from the temperature sensor. It describes a configuration that determines the power voltage applied to the OLED display device according to the temperature data.

Republic of Korea Patent Publication No. 10-0680913 (announced on February 8, 2007)

The purpose of the present invention is to minimize overheating of an organic light emitting diode display device by controlling the current supplied to the panel based on current information supplied to the panel without separately providing a measuring element such as a temperature sensor.

An organic light emitting diode display device according to an embodiment of the present invention includes a panel on which a plurality of pixels are arranged, a power supply unit that supplies current to the panel, and acquisition of current information supplied to the panel, and converts the current supplied to the panel into a preset current. It includes a control unit that performs automatic current limit to control the current limit below the limit value, and the control unit can adjust the current limit value based on current information supplied to the panel.

The control unit may calculate the accumulated current based on the current information supplied to the panel, and set the current limit value to a general limit value or a luminance limit value smaller than the general limit value based on the accumulated current.

The control unit can calculate the cumulative current by adding up the difference between the current current supplied to the panel at each set cycle and the reference value.

The reference value may be smaller than the luminance limit value.

The control unit may set the current limit value to the brightness limit value if the accumulated current is greater than the reduction condition value, and may set the current limit value to the general limit value if the accumulated current is less than the increase condition value.

If the current limit value is set to the general limit value, the control unit maintains the current limit value as the general limit value if the accumulated current is less than the decrease condition value, and if the current limit value is set to the luminance limit value, the control unit maintains the current limit value if the accumulated current is greater than the increase condition value. The limit value can be maintained as a luminance limit value.

If the accumulated current is less than a preset minimum value, the control unit may correct the accumulated current to the minimum value.

If the accumulated current is greater than the preset maximum value, the control unit may correct the accumulated current to the maximum value.

The control unit can adjust the current limit value when the temperature reduction function is set and fix the current limit value when the temperature reduction function is disabled.

When the temperature reduction function is set, the control unit sets the current limit value to a general limit value or a luminance limit value smaller than the general limit value, and when the temperature reduction function is disabled, the current limit value can be fixed to either the general limit value or the luminance limit value.

When the control unit receives a command to set the temperature reduction function while the temperature reduction function is disabled, it initializes the accumulated current to 0 and then calculates the accumulated current. Based on the accumulated current, the current limit value can be set as a general limit value or a brightness limit value. there is.

When adjusting the current limit value, the control unit may gradually increase the current limit value according to the set ratio or gradually decrease it according to the set ratio.

The control unit can compare the current current supplied to the panel with the set value and set the current limit value to a general limit value or a luminance limit value smaller than the general limit value.

The control unit may set the current limit value to the general limit value if the current current is less than the set value, and set the current limit value to the luminance limit value if the current current is greater than the set value.

A method of operating an organic light emitting diode display device according to an embodiment of the present invention includes supplying current to the panel, and performing automatic current limit to control the current supplied to the panel below a preset current limit value. It may include a step of detecting a current supplied to the panel, and a step of adjusting a current limit value based on the sensed current.

According to an embodiment of the present invention, there is an advantage in that the overheating problem of the panel can be minimized by reducing the temperature of the panel by adjusting the current limit value based on the current information supplied to the panel.

Additionally, by adjusting the current limit value based on the accumulated current calculated according to the current current supplied to the panel, there is an advantage in minimizing user inconvenience caused by sudden changes in image brightness.

In addition, when the current limit value is lowered based on the accumulated current, panel overheating can be minimized by ensuring time for the panel temperature to drop by not immediately increasing the current limit value when the current supplied to the panel temporarily decreases. There is an advantage.

In addition, if the accumulated current is lowered to an unlimited extent, the time required to lower the current limit value again becomes longer even though the current supplied to the panel increases, which has the advantage of minimizing panel overheating.

In addition, if the accumulated current increases without limit, the time required to increase the current limit value again becomes longer even though the current supplied to the panel decreases, which has the advantage of minimizing the problem of delayed recovery of image luminance.

Additionally, there is an advantage in that the user can select priority between solving the panel overheating problem and securing the brightness of the image by turning on/off the temperature reduction function.

In addition, when changing the temperature reduction function from the disabled state to the enabled state, the accumulated current is initialized to 0, which has the advantage of improving reliability by minimizing the problem of performance changes each time the temperature reduction function is set.

Additionally, when adjusting the current limit value, sudden changes in luminance can be minimized by gradually increasing or decreasing the current limit value by a set ratio.

According to another embodiment of the present invention, the temperature of the panel can be reduced and the occurrence of errors can be minimized through a simple algorithm that adjusts the current limit value according to the current current supplied to the panel.

1 is a diagram illustrating an image display device according to an embodiment of the present invention.
FIG. 2 is an example of an internal block diagram of the video display device of FIG. 1.
FIG. 3 is an example of an internal block diagram of the control unit of FIG. 2.
FIG. 4A is a diagram illustrating a control method of the remote control device of FIG. 2.
Figure 4b is an internal block diagram of the remote control device of Figure 2.
Figure 5 is an internal block diagram of the display of Figure 2.
FIGS. 6A to 6B are diagrams referenced in the description of the organic light emitting panel of FIG. 5.
Figure 7 is a flowchart showing a method of operating an image display device according to the first embodiment of the present invention.
Figure 8 is an example graph showing the operation of an image display device according to the first embodiment of the present invention.
Figure 9 is a flowchart showing a method of operating an image display device according to a second embodiment of the present invention.
Figure 10 is a graph showing the relationship between accumulated current (X) and current limit value (Y) according to the second embodiment of the present invention.
11 to 14 are example graphs showing the operation of an image display device according to a second embodiment of the present invention.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

The suffixes “module” and “part” for components used in the following description are simply given in consideration of the ease of writing this specification, and do not in themselves give any particularly important meaning or role. Accordingly, the terms “module” and “unit” may be used interchangeably.

1 is a diagram illustrating an image display device according to an embodiment of the present invention.

Referring to the drawings, the image display device 100 may include a display 180.

Meanwhile, the display 180 may be implemented as any one of various panels. For example, the display 180 may be one of a liquid crystal display panel (LCD panel), an organic light emitting panel (OLED panel), an inorganic light emitting panel (LED panel), etc.

In the present invention, the display 180 is provided with an organic light emitting panel (OLED panel).

Meanwhile, the video display device 100 in FIG. 1 can be a monitor, TV, tablet PC, mobile terminal, etc.

FIG. 2 is an example of an internal block diagram of the video display device of FIG. 1.

Referring to FIG. 2, the video display device 100 according to an embodiment of the present invention includes a broadcast reception unit 105, an external device interface unit 130, a storage unit 140, a user input interface unit 150, It may include a sensor unit (not shown), a control unit 170, a display 180, an audio output unit 185, and a power supply unit 190.

The broadcast reception unit 105 may include a tuner unit 110, a demodulator 120, a network interface unit 135, and an external device interface unit 130.

Meanwhile, unlike the drawing, the broadcast receiver 105 may include only a tuner unit 110, a demodulator 120, and an external device interface unit 130. That is, it may not include the network interface unit 135.

The tuner unit 110 selects an RF broadcast signal corresponding to a channel selected by the user or all previously stored channels among RF (Radio Frequency) broadcast signals received through an antenna (not shown). Additionally, the selected RF broadcast signal is converted into an intermediate frequency signal or baseband video or audio signal.

For example, if the selected RF broadcasting signal is a digital broadcasting signal, it is converted to a digital IF signal (DIF), and if the selected RF broadcasting signal is an analog broadcasting signal, it is converted to an analog baseband video or audio signal (CVBS/SIF). That is, the tuner unit 110 can process digital broadcasting signals or analog broadcasting signals. The analog base band video or audio signal (CVBS/SIF) output from the tuner unit 110 may be directly input to the control unit 170.

Meanwhile, the tuner unit 110 may be equipped with multiple tuners in order to receive broadcast signals of multiple channels. Alternatively, a single tuner that simultaneously receives broadcast signals from multiple channels is also possible.

The demodulator 120 receives the digital IF signal (DIF) converted by the tuner unit 110 and performs a demodulation operation.

The demodulator 120 may perform demodulation and channel decoding and then output a stream signal (TS). At this time, the stream signal may be a multiplexed video signal, audio signal, or data signal.

The stream signal output from the demodulator 120 may be input to the control unit 170. After performing demultiplexing and video/audio signal processing, the control unit 170 outputs video to the display 180 and audio to the audio output unit 185.

The external device interface unit 130 may transmit or receive data with a connected external device (not shown), for example, a set-top box. To this end, the external device interface unit 130 may include an A/V input/output unit (not shown).

The external device interface unit 130 can be connected wired/wireless to external devices such as DVD (Digital Versatile Disk), Blu ray, game device, camera, camcorder, computer (laptop), set-top box, etc. , input/output operations can also be performed with external devices.

The A/V input/output unit can receive video and audio signals from an external device. Meanwhile, the wireless communication unit (not shown) can perform short-range wireless communication with other electronic devices.

Through this wireless communication unit (not shown), the external device interface unit 130 can exchange data with an adjacent mobile terminal (not shown). In particular, the external device interface unit 130 may receive device information, executing application information, application images, etc. from a mobile terminal (not shown) in mirroring mode.

The network interface unit 135 provides an interface for connecting the video display device 100 to a wired/wireless network including an Internet network. For example, the network interface unit 135 may receive content or data provided by the Internet or a content provider or network operator through a network.

Meanwhile, the network interface unit 135 may include a wireless communication unit (not shown).

The storage unit 140 may store programs for processing and controlling each signal in the control unit 170, or may store processed video, audio, or data signals.

Additionally, the storage unit 140 may perform a function for temporarily storing video, voice, or data signals input to the external device interface unit 130. Additionally, the storage unit 140 can store information about a certain broadcast channel through a channel memory function such as a channel map.

Although FIG. 2 shows an embodiment in which the storage unit 140 is provided separately from the control unit 170, the scope of the present invention is not limited thereto. The storage unit 140 may be included in the control unit 170.

The user input interface unit 150 transmits a signal input by the user to the control unit 170 or transmits a signal from the control unit 170 to the user.

For example, transmitting/receiving user input signals such as power on/off, channel selection, and screen settings from the remote control device 200, or local keys such as power key, channel key, volume key, and setting value (not shown). The user input signal input from the control unit 170 is transmitted to the control unit 170, the user input signal input from the sensor unit (not shown) that senses the user's gesture is transmitted to the control unit 170, or the signal from the control unit 170 is transmitted to the control unit 170. It can be transmitted to the sensor unit (not shown).

The control unit 170 demultiplexes the input stream or processes the demultiplexed signals through the tuner unit 110, demodulator 120, network interface unit 135, or external device interface unit 130. , signals for video or audio output can be generated and output.

The image signal processed by the control unit 170 may be input to the display 180 and displayed as an image corresponding to the image signal. Additionally, the image signal processed by the control unit 170 may be input to an external output device through the external device interface unit 130.

The voice signal processed by the control unit 170 may be output as sound to the audio output unit 185. Additionally, the voice signal processed by the control unit 170 may be input to an external output device through the external device interface unit 130.

Although not shown in FIG. 2, the control unit 170 may include a demultiplexer, an image processor, etc. This will be described later with reference to FIG. 3.

In addition, the control unit 170 can control overall operations within the image display device 100. For example, the control unit 170 may control the tuner unit 110 to select (tuning) an RF broadcast corresponding to a channel selected by the user or a pre-stored channel.

Additionally, the control unit 170 can control the image display device 100 by a user command input through the user input interface unit 150 or an internal program.

Meanwhile, the control unit 170 can control the display 180 to display an image. At this time, the image displayed on the display 180 may be a still image or a moving image, and may be a 2D image or a 3D image.

Meanwhile, the control unit 170 can cause a predetermined object to be displayed in an image displayed on the display 180. For example, the object may be at least one of a connected web screen (newspaper, magazine, etc.), EPG (Electronic Program Guide), various menus, widgets, icons, still images, videos, and text.

Meanwhile, the control unit 170 may recognize the user's location based on the image captured by the photographing unit (not shown). For example, the distance (z-axis coordinate) between the user and the video display device 100 can be determined. In addition, the x-axis coordinate and y-axis coordinate within the display 180 corresponding to the user's location can be determined.

The display 180 converts the video signal, data signal, OSD signal, and control signal processed by the control unit 170 or the video signal, data signal, and control signal received from the external device interface unit 130 to provide a driving signal. Create.

Meanwhile, the display 180 can be configured as a touch screen and used as an input device in addition to an output device.

The audio output unit 185 receives the audio-processed signal from the control unit 170 and outputs it as audio.

The photography unit (not shown) photographs the user. The photographing unit (not shown) can be implemented with one camera, but is not limited to this, and can also be implemented with a plurality of cameras. Image information captured by a photographing unit (not shown) may be input to the control unit 170.

The control unit 170 may detect a user's gesture based on each or a combination of an image captured from a photographing unit (not shown) or a signal detected from a sensor unit (not shown).

The power supply unit 190 supplies the corresponding power throughout the image display device 100. In particular, power can be supplied to the control unit 170, which can be implemented in the form of a system on chip (SOC), the display 180 for displaying images, and the audio output unit 185 for audio output. there is.

Specifically, the power supply unit 190 may include a converter that converts alternating current power to direct current power and a dc/dc converter that converts the level of direct current power.

The remote control device 200 transmits user input to the user input interface unit 150. For this purpose, the remote control device 200 may use Bluetooth, Radio Frequency (RF) communication, infrared (IR) communication, Ultra Wideband (UWB), ZigBee, etc. Additionally, the remote control device 200 may receive video, audio, or data signals output from the user input interface unit 150, and display them or output audio signals on the remote control device 200.

Meanwhile, the above-described video display device 100 may be a fixed or mobile digital broadcasting receiver capable of receiving digital broadcasting.

Meanwhile, the block diagram of the image display device 100 shown in FIG. 2 is a block diagram for an embodiment of the present invention. Each component of the block diagram may be integrated, added, or omitted depending on the specifications of the video display device 100 that is actually implemented. That is, as needed, two or more components may be combined into one component, or one component may be subdivided into two or more components. In addition, the functions performed by each block are for explaining embodiments of the present invention, and the specific operations or devices do not limit the scope of the present invention.

FIG. 3 is an example of an internal block diagram of the control unit of FIG. 2.

When described with reference to the drawings, the control unit 170 according to an embodiment of the present invention includes a demultiplexer 310, an image processor 320, a processor 330, an OSD generator 340, and a mixer 345. , a frame rate converter 350, and a formatter 360. In addition, it may further include an audio processing unit (not shown) and a data processing unit (not shown).

The demultiplexer 310 demultiplexes the input stream. For example, when MPEG-2 TS is input, it can be demultiplexed and separated into video, voice, and data signals. Here, the stream signal input to the demultiplexer 310 may be a stream signal output from the tuner unit 110, demodulator 120, or external device interface unit 130.

The image processing unit 320 may perform image processing of demultiplexed video signals. For this purpose, the image processing unit 320 may include an image decoder 325 and a scaler 335.

The video decoder 325 decodes the demultiplexed video signal, and the scaler 335 performs scaling so that the resolution of the decoded video signal can be output on the display 180.

The video decoder 325 can be equipped with decoders of various standards. For example, an MPEG-2, H,264 decoder, a 3D image decoder for color image and depth image, a decoder for multiple viewpoint images, etc. may be provided.

The processor 330 may control overall operations within the image display device 100 or the control unit 170. For example, the processor 330 may control the tuner 110 to select (tuning) an RF broadcast corresponding to a channel selected by the user or a pre-stored channel.

In addition, the processor 330 can control the image display device 100 by a user command input through the user input interface unit 150 or an internal program.

Additionally, the processor 330 may perform data transmission control with the network interface unit 135 or the external device interface unit 130.

Additionally, the processor 330 may control the operations of the demultiplexer 310, the image processor 320, and the OSD generator 340 within the control unit 170.

The OSD generator 340 generates an OSD signal according to user input or by itself. For example, based on a user input signal, a signal can be generated to display various information in graphics or text on the screen of the display 180. The generated OSD signal may include various data such as a user interface screen of the video display device 100, various menu screens, widgets, and icons. Additionally, the generated OSD signal may include 2D objects or 3D objects.

Additionally, the OSD generator 340 may generate a pointer that can be displayed on the display based on the pointing signal input from the remote control device 200. In particular, such a pointer may be generated in a pointing signal processor, and the OSD generator 340 may include such a pointing signal processor (not shown). Of course, it is also possible that the pointing signal processor (not shown) is provided separately rather than within the OSD generator 340.

The mixer 345 may mix the OSD signal generated by the OSD generator 340 and the decoded image signal processed by the image processor 320. The mixed video signal is provided to the frame rate converter 350.

The frame rate converter (FRC) 350 can convert the frame rate of the input video. Meanwhile, the frame rate conversion unit 350 is also capable of outputting the image as is without separate frame rate conversion.

Meanwhile, the formatter 360 can change the format of an input image signal into an image signal for display on a display and output it.

The formatter 360 can change the format of the video signal. For example, the format of the 3D video signal is Side by Side format, Top / Down format, Frame Sequential format, Interlaced format, Checker Box. It can be changed to any one of various 3D formats such as format.

Meanwhile, the audio processing unit (not shown) in the control unit 170 may perform audio processing of the demultiplexed audio signal. For this purpose, the audio processing unit (not shown) may be equipped with various decoders.

Additionally, the audio processing unit (not shown) within the control unit 170 can process bass, treble, and volume control.

The data processing unit (not shown) within the control unit 170 may perform data processing of the demultiplexed data signal. For example, if the demultiplexed data signal is an encoded data signal, it can be decoded. The encoded data signal may be electronic program guide information including broadcast information such as the start time and end time of the broadcast program aired on each channel.

Meanwhile, the block diagram of the control unit 170 shown in FIG. 3 is a block diagram for one embodiment of the present invention. Each component of the block diagram may be integrated, added, or omitted depending on the specifications of the control unit 170 that is actually implemented.

In particular, the frame rate converter 350 and the formatter 360 may not be provided within the control unit 170, but may be provided separately or as a single module.

FIG. 4A is a diagram illustrating a control method of the remote control device of FIG. 2.

As shown in (a) of FIG. 4A, a pointer 205 corresponding to the remote control device 200 is displayed on the display 180.

The user can move or rotate the remote control device 200 up and down, left and right ((b) in FIG. 4A), and forward and backward ((c) in FIG. 4A). The pointer 205 displayed on the display 180 of the video display device corresponds to the movement of the remote control device 200. As shown in the drawing, this remote control device 200 can be called a spatial remote control or a 3D pointing device because the corresponding pointer 205 is moved and displayed according to movement in 3D space.

Figure 4a (b) illustrates that when the user moves the remote control device 200 to the left, the pointer 205 displayed on the display 180 of the video display device also moves to the left correspondingly.

Information about the movement of the remote control device 200 detected through the sensor of the remote control device 200 is transmitted to the video display device. The image display device can calculate the coordinates of the pointer 205 from information about the movement of the remote control device 200. The image display device can display the pointer 205 to correspond to the calculated coordinates.

(c) of FIG. 4A illustrates a case where the user moves the remote control device 200 away from the display 180 while pressing a specific button in the remote control device 200. As a result, the selected area in the display 180 corresponding to the pointer 205 can be zoomed in and displayed enlarged. Conversely, when the user moves the remote control device 200 closer to the display 180, the selected area in the display 180 corresponding to the pointer 205 may be zoomed out and displayed in a reduced size. Meanwhile, when the remote control device 200 moves away from the display 180, the selected area may be zoomed out, and when the remote control device 200 approaches the display 180, the selected area may be zoomed in.

Meanwhile, when a specific button in the remote control device 200 is pressed, recognition of up-down, left-right movement may be excluded. That is, when the remote control device 200 moves away from or approaches the display 180, up, down, left, and right movements are not recognized, and only forward and backward movements can be recognized. When a specific button in the remote control device 200 is not pressed, only the pointer 205 moves as the remote control device 200 moves up, down, left, and right.

Meanwhile, the moving speed or direction of the pointer 205 may correspond to the moving speed or direction of the remote control device 200.

Figure 4b is an internal block diagram of the remote control device of Figure 2.

When described with reference to the drawings, the remote control device 200 includes a wireless communication unit 420, a user input unit 430, a sensor unit 440, an output unit 450, a power supply unit 460, a storage unit 470, It may include a control unit 480.

The wireless communication unit 420 transmits and receives signals to and from any one of the image display devices according to the embodiments of the present invention described above. Among the image display devices according to embodiments of the present invention, one image display device 100 will be described as an example.

In this embodiment, the remote control device 200 may be provided with an RF module 421 that can transmit and receive signals with the image display device 100 according to RF communication standards. Additionally, the remote control device 200 may be equipped with an IR module 423 that can transmit and receive signals with the image display device 100 according to IR communication standards.

In this embodiment, the remote control device 200 transmits a signal containing information about the movement of the remote control device 200 to the image display device 100 through the RF module 421.

Additionally, the remote control device 200 may receive a signal transmitted by the image display device 100 through the RF module 421. Additionally, the remote control device 200 may transmit commands for power on/off, channel change, volume change, etc. to the image display device 100 through the IR module 423, as needed.

The user input unit 430 may be comprised of a keypad, button, touch pad, or touch screen. The user can manipulate the user input unit 430 to input commands related to the image display device 100 through the remote control device 200. If the user input unit 430 is provided with a hard key button, the user can input a command related to the image display device 100 to the remote control device 200 through a push operation of the hard key button. If the user input unit 430 has a touch screen, the user can input commands related to the video display device 100 through the remote control device 200 by touching a soft key on the touch screen. Additionally, the user input unit 430 may be provided with various types of input means that the user can operate, such as scroll keys and jog keys, and this embodiment does not limit the scope of the present invention.

The sensor unit 440 may include a gyro sensor 441 or an acceleration sensor 443. The gyro sensor 441 can sense information about the movement of the remote control device 200.

For example, the gyro sensor 441 may sense information about the operation of the remote control device 200 based on the x, y, and z axes. The acceleration sensor 443 can sense information about the moving speed of the remote control device 200, etc. Meanwhile, a distance measuring sensor may be further provided, thereby allowing the distance to the display 180 to be sensed.

The output unit 450 may output a video or audio signal corresponding to an operation of the user input unit 430 or a signal transmitted from the video display device 100. Through the output unit 450, the user can recognize whether the user input unit 430 is operated or whether the image display device 100 is controlled.

For example, the output unit 450 includes an LED module 451 that turns on when the user input unit 430 is manipulated or a signal is transmitted and received with the image display device 100 through the wireless communication unit 420, and a vibration module that generates vibration ( 453), a sound output module 455 that outputs sound, or a display module 457 that outputs an image.

The power supply unit 460 supplies power to the remote control device 200. The power supply unit 460 can reduce power waste by stopping power supply when the remote control device 200 does not move for a predetermined period of time. The power supply unit 460 can resume power supply when a predetermined key provided in the remote control device 200 is operated.

The storage unit 470 may store various types of programs, application data, etc. necessary for controlling or operating the remote control device 200. If the remote control device 200 transmits and receives signals wirelessly through the video display device 100 and the RF module 421, the remote control device 200 and the video display device 100 transmit signals through a predetermined frequency band. Send and receive. The control unit 480 of the remote control device 200 stores information about the video display device 100 paired with the remote control device 200 and the frequency band capable of wirelessly transmitting and receiving signals, in the storage unit 470. You can refer to it.

The control unit 480 controls all matters related to the control of the remote control device 200. The control unit 480 transmits a signal corresponding to a predetermined key operation of the user input unit 430 or a signal corresponding to the movement of the remote control device 200 sensed by the sensor unit 440 to the image display device through the wireless communication unit 420. It can be sent to (100).

The user input interface unit 150 of the image display device 100 includes a wireless communication unit 411 capable of wirelessly transmitting and receiving signals with the remote control device 200, and a pointer corresponding to the operation of the remote control device 200. A coordinate value calculation unit 415 capable of calculating coordinate values may be provided.

The user input interface unit 150 can transmit and receive signals wirelessly with the remote control device 200 through the RF module 412. Additionally, the remote control device 200 can receive signals transmitted according to IR communication standards through the IR module 413.

The coordinate value calculation unit 415 corrects hand tremor or errors from the signal corresponding to the operation of the remote control device 200 received through the wireless communication unit 411 and calculates the coordinate value of the pointer 205 to be displayed on the display 180. (x,y) can be calculated.

The remote control device 200 transmission signal input to the image display device 100 through the user input interface unit 150 is transmitted to the control unit 170 of the image display device 100. The control unit 170 can determine information about the operation and key manipulation of the remote control device 200 from signals transmitted from the remote control device 200 and control the image display device 100 in response.

As another example, the remote control device 200 may calculate pointer coordinates corresponding to the operation and output them to the user input interface unit 150 of the image display device 100. In this case, the user input interface unit 150 of the image display device 100 can transmit information about the received pointer coordinate value to the control unit 180 without a separate hand shake or error correction process.

Additionally, as another example, the coordinate value calculation unit 415 may be provided inside the control unit 170 rather than the user input interface unit 150 as shown in the drawing.

Figure 5 is an internal block diagram of the display of Figure 2.

Referring to the drawing, the display 180 based on an organic light emitting panel includes an organic light emitting panel 210, a first interface unit 230, a second interface unit 231, a timing controller 232, and a gate driver 234. , it may include a data driver 236, a memory 240, a processor 270, a power supply unit 290, a current detection unit 1110, etc.

The display 180 may receive the image signal Vd, the first DC power source V1, and the second DC power source V2, and display a predetermined image based on the image signal Vd.

Meanwhile, the first interface unit 230 in the display 180 may receive an image signal (Vd) and a first DC power source (V1) from the control unit 170.

Here, the first DC power source V1 may be used to operate the power supply unit 290 and the timing controller 232 within the display 180.

Next, the second interface unit 231 may receive the second direct current power (V2) from the external power supply unit 190. Meanwhile, the second DC power source V2 may be input to the data driver 236 in the display 180.

The timing controller 232 may output a data driving signal (Sda) and a gate driving signal (Sga) based on the image signal (Vd).

For example, when the first interface unit 230 converts the input video signal Vd and outputs the converted video signal Va1, the timing controller 232 operates based on the converted video signal Va1. Thus, the data driving signal (Sda) and the gate driving signal (Sga) can be output.

The timing controller 232 may further receive a control signal, a vertical synchronization signal (Vsync), etc. in addition to the video signal (Vd) from the control unit 170.

In addition, the timing controller 232 provides a gate drive signal (Sga) and data for the operation of the gate driver 234 based on a control signal, a vertical synchronization signal (Vsync), etc., in addition to the video signal (Vd). A data driving signal (Sda) for operation of the driver 236 may be output.

At this time, the data driving signal Sda may be a data driving signal for driving RGBW subpixels when the panel 210 includes RGBW subpixels.

Meanwhile, the timing controller 232 may further output a control signal Cs to the gate driver 234.

The gate driver 234 and the data driver 236 operate through the gate line GL and the data line DL, respectively, according to the gate drive signal Sga and the data drive signal Sda from the timing controller 232. , scanning signals and image signals are supplied to the organic light emitting panel 210. Accordingly, the organic light emitting panel 210 displays a predetermined image.

Meanwhile, the organic light emitting panel 210 may include an organic light emitting layer, and in order to display an image, a plurality of gate lines (GL) and data lines (DL) are formed in a matrix form in each pixel corresponding to the organic light emitting layer. Can be placed crosswise.

Meanwhile, the data driver 236 may output a data signal to the organic light emitting panel 210 based on the second direct current power source V2 from the second interface unit 231.

The power supply unit 290 can supply various types of power to the gate driver 234, the data driver 236, the timing controller 232, etc.

The current detection unit 1110 can detect the current flowing in the subpixel of the organic light emitting panel 210. The detected current may be input to the processor 270, etc. for cumulative current calculation.

The processor 270 can perform various types of control within the display 180. For example, the gate driver 234, data driver 236, timing controller 232, etc. can be controlled.

Meanwhile, the processor 270 may receive information about the current flowing in the subpixel of the organic light emitting panel 210 from the current detection unit 1110.

In addition, the processor 270 may calculate the accumulated current of the subpixels of each organic light emitting panel 210 based on the current information flowing in the subpixels of the organic light emitting panel 210. The calculated cumulative current may be stored in the memory 240.

Meanwhile, the processor 270 may determine burn in when the accumulated current of the subpixels of each organic light emitting panel 210 is greater than the allowable value.

For example, the processor 270 may determine that a subpixel of each organic light emitting panel 210 is burned-in when the accumulated current of the subpixel is 300,000 A or more.

Meanwhile, when the accumulated current of some subpixels among the subpixels of each organic light emitting panel 210 approaches the allowable value, the processor 270 may determine that the corresponding subpixel is a subpixel in which burn-in is predicted.

Meanwhile, the processor 270 may determine the subpixel with the largest accumulated current as the burn-in prediction subpixel, based on the current detected by the current detection unit 1110.

FIGS. 6A to 6B are diagrams referenced in the description of the organic light emitting panel of FIG. 5.

First, FIG. 6A is a diagram showing pixels within the organic light emitting panel 210.

Referring to the drawing, the organic light emitting panel 210 includes a plurality of scan lines (Scan 1 to Scan n) and a plurality of data lines (R1, G1, B1, W1 to Rm, Gm, Bm, Wm) that intersect therewith. can be provided.

Meanwhile, a pixel is defined in the intersection area of the scan line and the data line in the organic light emitting panel 210. In the drawing, a pixel including RGBW subpixels (SP _r1 , SP _g1 , SP _b1 , SP _w1 ) is shown.

FIG. 6B illustrates a circuit of one sub pixel within a pixel of the organic light emitting panel of FIG. 6A.

Referring to the drawing, the organic light-emitting sub-pixel circuit (CRTm) is an active type and includes a scan switching element (SW1), a storage capacitor (Cst), a drive switching element (SW2), and an organic light-emitting layer (OLED). You can.

The scan switching element (SW1) has a scan line connected to the gate terminal, and is turned on according to the input scan signal (Vscan). When turned on, the input data signal (Vdata) is transmitted to the gate terminal of the driving switching element (SW2) or one end of the storage capacitor (Cst).

The storage capacitor (Cst) is formed between the gate terminal and the source terminal of the driving switching element (SW2), and has a data signal level delivered to one end of the storage capacitor (Cst) and a direct current delivered to the other end of the storage capacitor (Cst). The predetermined difference in power (Vdd) level is stored.

For example, when data signals have different levels according to the PAM (Plus Amplitude Modulation) method, the power level stored in the storage capacitor Cst varies depending on the level difference of the data signal Vdata.

As another example, when the data signal has different pulse widths according to the PWM (Plus Width Modulation) method, the power level stored in the storage capacitor (Cst) varies according to the difference in pulse width of the data signal (Vdata).

The driving switching element SW2 is turned on according to the power level stored in the storage capacitor Cst. When the driving switching element (SW2) is turned on, a driving current (I _OLED ) proportional to the stored power level flows through the organic light emitting layer (OLED). Accordingly, the organic light emitting layer (OLED) performs a light emitting operation.

The organic light emitting layer (OLED) includes an RGBW light emitting layer (EML) corresponding to a subpixel, and at least one of a hole injection layer (HIL), a hole transport layer (HTL), an electron transport layer (ETL), and an electron injection layer (EIL). It may include, and may also include a hole blocking layer.

Meanwhile, subpixels all output white light from the organic light emitting layer (OLED), but in the case of green, red, and blue subpixels, separate color filters are provided to implement colors. That is, in the case of green, red, and blue subpixels, green, red, and blue color filters are further provided, respectively. Meanwhile, in the case of white subpixels, white light is output, so there is no need for a separate color filter.

Meanwhile, in the drawing, the scan switching element (SW1) and the drive switching element (SW2) are exemplified as p-type MOSFETs, but may be n-type MOSFETs or other switching elements such as JFET, IGBT, or SIC. It is also possible to use

Meanwhile, the control unit 170 may implement automatic current limit (ACL) to limit the brightness of the image from increasing above a certain brightness.

Here, the automatic current limit (ACL) determines the average luminance level (Average Picture Level: APL) of the organic light emitting panel 210 by summing the total data values for displaying an image on the organic light emitting panel 210, and the average brightness This can be a method of lowering the brightness of the entire screen by adjusting the light emission section according to the level or controlling the driving current by changing the image data itself.

Meanwhile, if the driving current supplied to the organic light emitting panel 210 is high, a problem may occur in which the temperature of the display 180 becomes excessively high.

In particular, even if the control unit 170 performs automatic current limiting (ACL) to limit the maximum value of the current supplied to the organic light emitting panel 210 to the current limit value, the amount of current supplied to the organic light emitting panel 210 may vary depending on the characteristics of the output image. The supply current may continue for more than a certain period of time at the current limit value, and in this case, the temperature of the organic light emitting panel 210 may become excessively high. For example, the characteristics of the output image may mean that the output image includes many secondary or tertiary colors, such as animation, or that the image mode is vivid mode.

The image display device 100 according to the present invention can adjust the current limit value based on current information supplied to the organic light emitting panel 210.

FIG. 7 is a flowchart showing the operation method of the image display device according to the first embodiment of the present invention, and FIG. 8 is an example graph showing the operation of the image display device according to the first embodiment of the present invention.

The control unit 170 may determine whether a command to set the temperature reduction function is received (S11).

The control unit 170 may determine whether a command to set the temperature reduction function has been received.

The user can set the temperature reduction function of the image display device 100 or disable the temperature reduction function of the image display device 100.

The control unit 170 may receive a user input through the interface unit 150, such as a command to set the temperature reduction function or a command to cancel the temperature reduction function.

Here, the temperature reduction function may mean a function of reducing the temperature of the organic light emitting panel 210 by adjusting the current limit value representing the maximum value of the current supplied to the organic light emitting panel 210. When the temperature reduction function is set, the current limit value can be changed, and when the temperature reduction function is disabled, the current limit value can be fixed.

The control unit 170 may adjust the current limit value (Y) when the temperature reduction function is set, and may fix the current limit value (Y)k when the temperature reduction function is disabled.

If the control unit 170 does not receive a command to set the temperature reduction function, the current limit value (Y) may be set to the general limit value (Y1) (S13).

Here, the current limit value (Y) may mean the maximum value of current that can be supplied to the organic light emitting panel 210 per frame by automatic current limit.

In the present invention, the current limit value (Y) has been described as being set to the general limit value (Y1) or the luminance limit value (Y2), but this is only an example and is not limited thereto. That is, the current limit value (Y) can be set to any one of two or more different current values.

The control unit 170 may determine whether the current current is greater than or equal to the set value (S17).

The control unit 170 may obtain the current current supplied to the organic light emitting panel 210 at preset intervals.

Specifically, the control unit 170 may receive current information supplied to the organic light emitting panel 210 per frame based on the R, G, and B data signals output by the timing controller 232, and obtain the current current. .

The set value is a value that serves as a standard for changing the current limit value (Y), and can be set in advance when installing the image display device 100. The setting value can be changed and set according to the specifications of the video display device 100, user commands, etc.

If the current current is less than the set value, the control unit 170 may set the current limit value (Y) to the general limit value (Y1) (S19).

Meanwhile, if the current current is greater than or equal to the set value, the control unit 170 may set the current limit value (Y) to a luminance limit value (Y2) that is lower than the general limit value (Y1) (S21).

When the current limit value (Y) is set to the luminance limit value (Y2), the luminance of the image may be lower than the luminance of the image when the current limit value (Y) is set to the general limit value (Y1).

The control unit 170 sets the current limit value (Y) to the general limit value (Y1) in the first state in which the temperature reduction function is released or in the second state in which the temperature reduction function is set but the current current is less than the set value, and the temperature reduction function is set to the general limit value (Y1). Although the reduction function is set, in the third state where the current current is above the set value, the current limit value (Y) can be set to a luminance limit value (Y2) lower than the general limit value (Y1).

Meanwhile, unlike shown in FIG. 7, the control unit 170 sets the current limit value (Y) to the general limit value (Y1) in the first state in which the temperature reduction function is released, and although the temperature reduction function is set, the current limit value (Y) is set to the general limit value (Y1). In the second state where the current is below the set value, the current limit value (Y) is set to the first luminance limit value (not shown) lower than the general limit value (Y1), and the temperature reduction function is set, but when the current current is above the set value, In the third state, the current limit value (Y) may be set to a second brightness limit value (not shown) that is lower than the first brightness limit value (not shown).

The control unit 170 may determine whether a command to cancel the temperature reduction function is received (S23).

The control unit 170 may determine whether a command to cancel the temperature reduction function has been received while the temperature reduction function is set.

Similar to the command to set the temperature reduction function, the control unit 170 may receive a command to cancel the temperature reduction function through the user input through the interface unit 150.

If the control unit 170 does not receive a command to cancel the temperature reduction function, it may return to step S17.

That is, the control unit 170 periodically measures the current current while the temperature reduction function is set, compares the measured current current with the set value, and sets the current limit value (Y) to the general limit value (Y1) or the luminance limit value (Y2). ) can be set.

Meanwhile, when the control unit 170 receives a command to cancel the temperature reduction function, it can set the current limit value (Y) to the general limit value (Y1) (S25).

That is, when the temperature reduction function is disabled, the control unit 170 can set the current limit value (Y) to the general limit value (Y1) regardless of the current current. However, the general limit value (Y1) is only an example, and when the temperature reduction function is released, the control unit 170 sets the current limit value (Y) to a range between the general limit value (Y1) and the brightness limit value (Y2). It can be fixed to any one value.

The current limit value (Y) set in step S13 and the current limit value (Y) set in step S25 may be the same.

Referring to the example of FIG. 8, the first time (0 to t1) may be when the temperature reduction function is released or the temperature reduction function is set, but the current current is lower than the set value (K), and in this case, the current limit The value (Y) may be a general current value (Y1). The second time (t1 to t2) is when the temperature reduction function is set and the current current is higher than the set value (K), and the current limit value (Y) may be the brightness limit value (Y2). The third time (t2~) may be when the temperature reduction function is released or the temperature reduction function is set, but the current current is lower than the set value (K), and the current limit value (Y) is the brightness limit value (Y2). can be changed to the general current value (Y1).

At this time, at the time (t1) (t2) when the current limit value (Y) changes, the current limit value (Y) gradually lowers from the general current value (Y1) to the luminance limit value (Y2), or the luminance limit value (Y2) It can be gradually increased from Y2) to the normal current value (Y1). That is, the current limit value (Y) may decrease at a preset rate or increase at a preset rate. In this case, a sudden change in the luminance of the output image can be minimized, thereby minimizing the sense of heterogeneity felt by the user.

As seen in FIGS. 7 and 8, when the current limit value (Y) is set to the luminance limit value (Y2), the organic light emitting panel 210 is larger than when the current limit value (Y1) is set to the general limit value (Y1). The current supplied to is lowered, and accordingly, the temperature of the organic light emitting panel 210 may be lower. That is, according to the first embodiment of the present invention, the temperature of the organic light emitting panel 210 can be reduced by comparing the current current supplied to the organic light emitting panel 210 with the set value, and the algorithm of the temperature reduction function can be simplified. there is.

FIG. 9 is a flowchart showing an operating method of an image display device according to a second embodiment of the present invention, and FIG. 10 is a relationship between accumulated current (X) and current limit value (Y) according to the second embodiment of the present invention. , and Figures 11 to 14 are example graphs showing the operation of the video display device according to the second embodiment of the present invention.

The control unit 170 may determine whether a command to set the temperature reduction function is received (S101).

Since this is the same as described in step S11 of FIG. 7, detailed description will be omitted.

If the control unit 170 does not receive a command to set the temperature reduction function, the current limit value (Y) may be set to the general limit value (Y1) (S103).

As described in step S13 of FIG. 7, the current limit value (Y) is described below as one of the general limit value (Y1) and the brightness limit value (Y2), but this is only an example, and the current limit value (Y1) ) can be set to any of two or more different current values.

If the control unit 170 does not receive a command to set the temperature reduction function, the current limit value (Y) may be set to the general limit value (Y1) (S103).

The general limit value (Y1) may be the largest value among the configurable current limit values (Y). The general limit value (Y1) may vary depending on the specifications of the video display device 100, etc.

When the control unit 170 receives a command to set the temperature reduction function, it can initialize the accumulated current (X) to 0 (S105).

When switching from the temperature reduction function off state to the temperature reduction function set state, the control unit 170 may initialize the accumulated current (X) to 0. Through this, reliability can be improved by minimizing cases where the performance of the temperature reduction function varies depending on the accumulated current (X) calculated last when setting the temperature reduction function.

In addition, the control unit 170 sets the current limit value (Y) to the general limit value (Y1) when the temperature reduction function is released, so when the temperature reduction function setting command is received when the temperature reduction function is released, the current limit value ( Y) may be set to the general limit value (Y1).

Depending on the embodiment, the control unit 170 may initialize the current limit value (Y) to the general limit value (Y1) when initializing the accumulated current (X) to 0.

The control unit 170 may initialize the accumulated current (X) to 0 and then calculate the accumulated current (X) (S107).

The control unit 170 may calculate the accumulated current (X) based on current information supplied to the organic light emitting panel 210. Specifically, the control unit 170 may calculate the cumulative current (X) by adding up the difference between the current current supplied to the organic light emitting panel 210 and the reference value.

The current current is a current value supplied to the organic light emitting panel 210 to output the current frame, and can be calculated based on the R, G, and B data signals output by the timing controller 232.

The reference value is a value set to determine whether the current current is high or low, and may vary depending on the specifications of the image display device 100.

The reference value may be less than or equal to the minimum value among the configurable current limit values (Y). The reference value may be smaller than the luminance limit value (Y2).

The control unit 170 may obtain a difference (d), which is the difference between the current current and the reference value, at each set period, and calculate the accumulated current (X) by adding up the obtained differences. That is, the control unit 170 acquires the difference (d), which is the difference between the current current and the reference value, according to Equation 1 below at every set cycle, and uses the difference (d) obtained according to Equation 2 below to calculate the immediately preceding cumulative current (X-1 ) can be added to calculate the cumulative current (X).

[Equation 1]

Difference (d)=current current - reference value

[Equation 2]

Cumulative current (X) = previous cumulative current (X-1) + difference (d)

Here, the setting period may be 30 seconds, but this is only an example and is not limited thereto.

After calculating the accumulated current (X), the control unit 170 may determine whether the calculated accumulated current (X) is greater than or equal to the reduction condition value (X1) (S109).

Here, the reduction condition value may be an accumulated current value that serves as a standard for reducing the current limit value (Y).

As shown in FIG. 10, the control unit 170 sets the current limit value (Y) to the general limit value (Y1) and, if the accumulated current ( ) can be changed from the general limit value (Y1) to the luminance limit value (Y2).

Meanwhile, when the current limit value (Y) is set to the general limit value (Y1), if the accumulated current (X) is less than the reduction condition value (X1), the current limit value (Y) can be maintained at the general limit value (Y1). .

If the accumulated current

At this time, the luminance limit value (Y2) may be smaller than the general limit value (Y1).

The control unit 170 sets the current limit value (Y) to the general limit value (Y1) when the accumulated current ( It can be reduced to the luminance limit value (Y2).

That is, the control unit 170 determines that the temperature of the organic light emitting panel 210 is above the reference temperature when the accumulated current ( As a result, the current supplied to the organic light emitting panel 210 can be reduced.

At this time, the control unit 170 may reduce the current limit value (Y) by a set ratio every predetermined time. That is, the control unit 170 can gradually reduce the current limit value (Y) to minimize the sense of strangeness felt by the user due to a sudden change in image brightness.

Meanwhile, the control unit 170 may maintain the current limit value (Y) at the general limit value (Y1) if the accumulated current (X) is less than the reduction condition value (X1).

That is, the control unit 170 determines that the organic light emitting panel 210 is not overheated when the accumulated current (

In addition, when the control unit 170 determines that the accumulated current (X) is less than the reduction condition value (X1), the control unit 170 determines whether the accumulated current (X) is less than the minimum value (Min If it is less than the minimum value (Min X), the accumulated current (X) can be corrected to the minimum value (Min X) (S113).

Meanwhile, if the accumulated current (X) is greater than the minimum value (Min

Here, the minimum value (Min

If the accumulated current (X) continues to decrease while the current limit value (Y) is set to the general limit value (Y1), the accumulated current ( The time required to calculate more than (X1) may be long, and the organic light emitting panel 210 may overheat during this time. Therefore, in the present invention, the minimum value of the accumulated current (X) is limited, and if the accumulated current (X) is less than the preset minimum value (Min X), the accumulated current (X) can be corrected to the minimum value (Min X).

For example, the minimum value (Min It can be corrected to 0.

Meanwhile, when the current limit value (Y) is changed from the general limit value (Y1) to the luminance limit value (Y2), the control unit 170 can determine whether the accumulated current (X) is less than the increase condition value (X2). There is (S117).

Here, the increase condition value may be an accumulated current value that serves as a standard for increasing the current limit value (Y).

As shown in FIG. 10, if the accumulated current ( ) can be changed from the luminance limit value (Y2) to the general limit value (Y1).

Meanwhile, in a state where the current limit value (Y) is set to the brightness limit value (Y2), if the accumulated current (X) is greater than the increase condition value (X2), the current limit value (Y) can be maintained at the brightness limit value (Y2). .

The increase condition value (X2) may be smaller than the decrease condition value (X1).

If the accumulated current (X) is less than the increase condition value (X2), the control unit 170 may set the current limit value (Y) to the general limit value (Y1) (S123).

When the current limit value (Y) is set to the luminance limit value (Y2) and the accumulated current ( can be increased to the general limit value (Y1).

That is, the control unit 170 determines that the temperature of the organic light emitting panel 210 is below the reference temperature when the accumulated current ( As a result, the current supplied to the organic light emitting panel 210 can be increased, and the brightness of the image can be increased.

At this time, the control unit 170 may increase the current limit value (Y) by a set ratio every predetermined time. That is, the control unit 170 can gradually increase the current limit value (Y) to minimize the sense of strangeness felt by the user due to a sudden change in image brightness.

Meanwhile, if the accumulated current

That is, the control unit 170 determines that the temperature of the organic light emitting panel 210 is still high when the accumulated current (

In addition, when the control unit 170 determines that the accumulated current (X) is greater than the increase condition value (X2), the control unit 170 determines (X119) whether the accumulated current ( If it is greater than the maximum value (Max X), the accumulated current (X) can be corrected to the maximum value (Max

Meanwhile, the control unit 170 may maintain the current accumulated current (X) when the accumulated current (X) is less than the maximum value (Max).

Here, the maximum value (Max

If the accumulated current (X) continues to increase while the current limit value (Y) is set to the luminance limit value (Y2), the accumulated current ( The time required to calculate the value below ( Therefore, in the present invention, the maximum value of the accumulated current (X) is limited, and if the accumulated current (X) is more than the preset maximum value (Max X), the accumulated current (X) can be corrected to the maximum value (Max .

For example, the maximum value (Max It can be corrected.

Meanwhile, the control unit 170 may change the current limit value (Y) from the brightness limit value (Y2) to the general limit value (Y1) and then determine whether to receive a command to cancel the temperature reduction function (S125). .

Unlike shown in FIG. 9, the control unit 170 may determine whether a command to cancel the temperature reduction function is continuously received while the temperature reduction function is set.

Upon receiving a command to cancel the temperature reduction function, the control unit 170 sets the current limit value (Y) to the general limit value (Y1) (S127) and returns to step S101.

That is, when the control unit 170 receives a command to cancel the temperature reduction function, it can set the current limit value (Y) to the general limit value (Y1) regardless of the accumulated current (X). However, the general limit value (Y1) is only an example, and when the temperature reduction function is released, the control unit 170 sets the current limit value (Y) in the range from the general limit value (Y1) to the brightness limit value (Y2). It can be fixed to any one value.

Meanwhile, when the control unit 170 does not receive a command to release the temperature reduction function and changes the current limit value (Y) from the brightness limit value (Y2) to the general limit value (Y1), the control unit 170 periodically changes the accumulated current ) After calculating, it can be determined whether the accumulated current (X) is greater than the reduction condition value (X1).

A method of calculating accumulated current and a method of setting a current limit value according to a second embodiment of the present invention will be described in detail with reference to the examples of FIGS. 11 to 14. 11 to 14, it is assumed that the general limit value (Y1) is 14, the luminance limit value (Y2) is 10, and the reference value is 9, but this is only an example and is not limited thereto.

t1, t2,... shown in FIGS. 11 to 14. , t24 may each be a point in time at which the accumulated current (X) according to the set period is calculated.

Referring to FIG. 11, 0 to t1 may be a state in which the temperature reduction function is disabled. According to one embodiment, when the temperature reduction function is disabled, the control unit 170 may control the accumulated current (X) to 0 regardless of the current current. According to another embodiment, the control unit 170 may not calculate the accumulated current (X) when the temperature reduction function is released, but may initialize the accumulated current (X) to 0 when receiving a command to set the temperature reduction function.

At time t1, the control unit 170 receives a command to set the temperature reduction function, and the current limit value (Y) may be the general limit value (Y1). The current limit value (Y) during the first time (t1 to t2) may be the general limit value (Y1) 14.

At time t2, the control unit 170 obtains the difference (d) 5 by subtracting the reference value 9 from the current current 14, and sets the accumulated current (X), which is the sum of the previous cumulative current (X-1) 0 and the difference (d) 5, to 5. It can be calculated as: At time t2, the accumulated current (

At time t3, the control unit 170 obtains the difference (d) 5 by subtracting the reference value 9 from the current current 14, and sets the accumulated current (X), which is the sum of the previous accumulated current (X-1) 5 and the difference (d) 5, to 10. It can be calculated as: At time t3, the accumulated current (

At time t4, the control unit 170 obtains the difference (d) 5 by subtracting the reference value 9 from the current current 14, and calculates the cumulative current (X), which is the sum of the previous accumulated current (X-1) 10 and the difference (d) 5, to 15. It can be calculated as: At time t4, the accumulated current (

At time t5, the control unit 170 obtains the difference (d) 5 by subtracting the reference value 9 from the current current 14, and sets the cumulative current (X), which is the sum of the previous cumulative current (X-1) 15 and the difference (d) 5, to 20. It can be calculated as: Since the accumulated current ( ) can be reduced to 10. For example, the control unit 170 may gradually decrease the current limit value (Y) during the fifth time period (t5 to t6).

At time t6, the control unit 170 obtains the difference (d) 1 by subtracting the reference value 9 from the current current 10, and calculates the cumulative current (X), which is the sum of the previous cumulative current (X-1) 20 and the difference (d) 1, to 21. It can be calculated as: At the point t6 when the current limit value (Y) is set to the brightness limit value (Y2), the accumulated current (X) 21 is more than 10, which is the increase condition value (X2), so the current limit value ( Y) may be a luminance limit value (Y2) of 10. Meanwhile, the control unit 170 can maintain the accumulated current (X) 21 because the accumulated current (X) 21 is less than 25, which is the maximum value (Max

Referring to FIG. 12, at time t7, the control unit 170 obtains the difference (d) 1 by subtracting the reference value 9 from the current current 10, and obtains the cumulative current (X-1) 21 and the difference (d) 1. The current (X) can be calculated as 22. At time t7, the accumulated current ( Meanwhile, the control unit 170 can maintain the accumulated current (X) 21 because the accumulated current (X) 22 is less than the maximum value (Max X) of 25.

At time t8, the control unit 170 obtains the difference (d) 1 by subtracting the reference value 9 from the current current 10, and calculates the cumulative current (X), which is the sum of the previous cumulative current (X-1) 22 and the difference (d) 1, to 23. It can be calculated as: At time t8, the accumulated current ( Meanwhile, the control unit 170 can maintain the accumulated current (X) 21 because the accumulated current (X) 23 is less than the maximum value (Max X) of 25.

At time t9, the control unit 170 obtains the difference (d) 1 by subtracting the reference value 9 from the current current 10, and calculates the cumulative current (X), which is the sum of the previous cumulative current (X-1) 23 and the difference (d) 1, to 24. It can be calculated as: At time t9, the accumulated current ( Meanwhile, the control unit 170 can maintain the accumulated current (X) 21 because the accumulated current (X) 24 is less than the maximum value (Max X) of 25.

At time t10, the control unit 170 obtains the difference (d) 1 by subtracting the reference value 9 from the current current 10, and calculates the cumulative current (X), which is the sum of the previous cumulative current (X-1) 24 and the difference (d) 1, to 25. It can be calculated as: At time t10, the accumulated current ( Meanwhile, the control unit 170 may correct the accumulated current (X) to 25 because the accumulated current (X) 25 is greater than the maximum value (Max X) of 25.

At time t11, the control unit 170 obtains the difference (d) 1 by subtracting the reference value 9 from the current current 10, and calculates the accumulated current (X), which is the sum of the previous cumulative current (X-1) 25 and the difference (d) 1, to 26. It can be calculated as: At time t11, the accumulated current ( Meanwhile, the control unit 170 may correct the accumulated current (X) 26 to 25, which is the maximum value (Max

At time t12, the control unit 170 obtains the difference (d) 1 by subtracting the reference value 9 from the current current 10, and obtains the accumulated current (X) which is the sum of the corrected previous cumulative current (X-1) 25 and the difference (d) 1. can be calculated as 26. At time t12, the accumulated current ( Meanwhile, the control unit 170 may correct the accumulated current (X) 26 to 25, which is the maximum value (Max

Referring to FIG. 13, at time t13, the control unit 170 obtains the difference (d) -5 by subtracting the reference value 9 from the current current 4, and calculates the corrected previous cumulative current (X-1) 25 and the difference (d) - The cumulative current (X), which is the sum of 5, can be calculated as 20. At time t13, the accumulated current ( Meanwhile, the control unit 170 can maintain the accumulated current (X) 20 because the accumulated current (X) 20 is less than the maximum value (Max X) of 25.

At time t14, the control unit 170 obtains a difference (d) -4.5 obtained by subtracting the reference value 9 from the current current 4.5, and obtains a cumulative current (X) that is the sum of the previous cumulative current (X-1) 20 and the difference (d) -4.5. can be calculated as 15.5. At time t14, the accumulated current ( Meanwhile, the control unit 170 can maintain the cumulative current (X) of 15.5 because it is less than the maximum value (Max X) of 25.

At time t15, the control unit 170 obtains a difference (d) -4.5 obtained by subtracting the reference value 9 from the current current 4.5, and obtains a cumulative current (X) that is the sum of the previous cumulative current (X-1) 15.5 and the difference (d) -4.5. can be calculated as 11. At time t15, the accumulated current ( Meanwhile, the control unit 170 can maintain the accumulated current (X) 11 because the accumulated current (X) 11 is less than 25, which is the maximum value (Max

At time t16, the control unit 170 obtains a difference (d) -4.5 obtained by subtracting the reference value 9 from the current current 4.5, and obtains a cumulative current (X) that is the sum of the previous cumulative current (X-1) 11 and the difference (d) -4.5. can be calculated as 6.5. At time t16, the accumulated current ( ) can be increased to 14. For example, the control unit 170 may gradually increase the current limit value (Y) during the 16th time (t16 to t17).

At time t17, the control unit 170 obtains a difference (d) -4.5 obtained by subtracting the reference value 9 from the current current 4.5, and obtains a cumulative current (X) that is the sum of the previous cumulative current (X-1) 6.5 and the difference (d) -4.5. can be calculated as 2. At time t17, the accumulated current ( Meanwhile, the control unit 170 can maintain the accumulated current (X) 2 because the accumulated current (X) 2 is greater than 1, which is the minimum value (Min X).

Referring to FIG. 14, at time t18, the control unit 170 obtains difference (d) 1 by subtracting the reference value 9 from the current current 10, and obtains the accumulated current (X-1) 2 and the difference (d) 1. Current (X) can be calculated as 3. At time t18, the accumulated current ( Meanwhile, the control unit 170 can maintain the accumulated current (X) 3 because the accumulated current (X) 3 is greater than 1, which is the minimum value (Min X).

At time t19, the control unit 170 obtains the difference (d) -2 by subtracting the reference value 9 from the current current 7, and obtains the cumulative current (X) which is the sum of the previous cumulative current (X-1) 3 and the difference (d) -2. can be calculated as 1. At time t19, the accumulated current ( Meanwhile, the control unit 170 can maintain the accumulated current (X) 1 because the accumulated current (X) 1 is greater than 1, which is the minimum value (Min X).

At time t20, the control unit 170 obtains the difference (d) -2 by subtracting the reference value 9 from the current current 7, and obtains the cumulative current (X) which is the sum of the previous cumulative current (X-1) 1 and the difference (d) -2. can be calculated as -1. At time t20, the accumulated current ( Meanwhile, the control unit 170 may correct the accumulated current (X) -1 to 1 because the accumulated current (X) -1 is less than 1, which is the minimum value (Min X).

At time t21, the control unit 170 obtains the difference (d) -2 by subtracting the reference value 9 from the current current 7, and calculates the accumulated current ( ) can be calculated as -1. At time t21, the accumulated current ( Meanwhile, the control unit 170 may correct the accumulated current (X) -1 to 1 because the accumulated current (X) -1 is less than 1, which is the minimum value (Min X).

At time t22, the control unit 170 obtains the difference (d) 5 by subtracting the reference value 9 from the current current 14, and calculates the accumulated current (X) which is the sum of the corrected accumulated current (X-1) 1 and the difference (d) 5. It can be calculated as 6. At time t22, the accumulated current ( Meanwhile, the control unit 170 can maintain the accumulated current (X) 6 because the accumulated current (X) 6 is greater than 1, which is the minimum value (Min X).

At time t23, the control unit 170 obtains the difference (d) 5 by subtracting the reference value 9 from the current current 14, and calculates the cumulative current (X), which is the sum of the previous cumulative current (X-1) 6 and the difference (d) 11, to 17. It can be calculated as: At time t23, the accumulated current (

At time t24, the control unit 170 obtains the difference (d) 3 by subtracting the reference value 9 from the current current 12, and sets the cumulative current (X), which is the sum of the previous accumulated current (X-1) 17 and the difference (d) 3, to 20. It can be calculated as: At time t24, the accumulated current ( It can be reduced to 10.

According to the second embodiment of the present invention, because the current limit value (Y) is changed based on the accumulated current (X) rather than the current current supplied to the organic light emitting panel 210, the R, G, Even if B data suddenly changes, the sudden change in image luminance can be minimized. For example, when the output image changes from a white image to a black image, or from a black image to a white image, the difference in the current supplied to the organic light emitting panel 210 is When the output image changes from a white image to a black image, or from a black image to a white image, the difference in accumulated current may be greater. In particular, when the current current is high for a certain period of time, as shown in t1 to t5 of FIG. 11, the current limit value (Y) decreases, and when the current current suddenly increases, as shown in t21 to t23 of FIG. 14, the current limit value (Y) decreases. Since it does not change, cases where the luminance of the image suddenly changes can be minimized.

The above description is merely an illustrative explanation of the technical idea of the present invention, and various modifications and variations will be possible to those skilled in the art without departing from the essential characteristics of the present invention.

Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but rather to explain it, and the scope of the technical idea of the present invention is not limited by these embodiments.

The scope of protection of the present invention should be interpreted in accordance with the claims below, and all technical ideas within the equivalent scope should be construed as being included in the scope of rights of the present invention.

Claims (15)

A panel on which a plurality of pixels are arranged;
a power supply unit that supplies current to the panel; and
A control unit that obtains information on the current supplied to the panel and performs automatic current limit to control the current supplied to the panel below a preset current limit value,
The control unit
Based on the current information supplied to the panel, the cumulative current is calculated by adding up the difference between the current current supplied to the panel and the reference value,
Compare the calculated accumulated current with at least one of a decrease condition value and an increase condition value,
Adjusting the current limit value to a general limit value or a luminance limit value smaller than the general limit value based on the comparison result.
Organic light emitting diode display device. delete delete According to paragraph 1,
The reference value is smaller than the luminance limit value.
Organic light emitting diode display device. According to paragraph 1,
The control unit
If the accumulated current is greater than the reduction condition value, set the current limit value to the brightness limit value,
If the accumulated current is less than the increase condition value, set the current limit value to the general limit value.
Organic light emitting diode display device. According to clause 5,
The control unit
When the current limit value is set to the general limit value, if the accumulated current is less than the reduction condition value, the current limit value is maintained at the general limit value,
When the current limit value is set to the brightness limit value, if the accumulated current is more than the increase condition value, the current limit value is maintained at the brightness limit value.
Organic light emitting diode display device. According to paragraph 1,
The control unit
If the accumulated current is less than the preset minimum value, correct the accumulated current to the minimum value.
Organic light emitting diode display device. According to paragraph 1,
The control unit
If the accumulated current is more than the preset maximum value, the accumulated current is corrected to the maximum value.
Organic light emitting diode display device. According to paragraph 1,
The control unit
If the temperature reduction function is set, adjust the current limit value,
Fixing the current limit value when the temperature reduction function is disabled
Organic light emitting diode display device. According to clause 9,
The control unit
When the temperature reduction function is set, set the current limit value to a general limit value or a luminance limit value smaller than the general limit value,
When the temperature reduction function is released, the current limit value is fixed to one of the general limit value and the brightness limit value.
Organic light emitting diode display device. According to clause 9,
The control unit
When a command to set the temperature reduction function is received while the temperature reduction function is released, the accumulated current is initialized to 0 and the accumulated current is calculated,
Setting the current limit value to a general limit value or a brightness limit value based on the accumulated current.
Organic light emitting diode display device. According to paragraph 1,
The control unit
When adjusting the current limit value, the current limit value is gradually increased according to the setting ratio or gradually decreased according to the setting ratio.
Organic light emitting diode display device. According to paragraph 1,
The control unit
Comparing the current current supplied to the panel with a set value and setting the current limit value to a general limit value or a luminance limit value smaller than the general limit value
Organic light emitting diode display device. According to clause 13,
The control unit
If the current current is less than the set value, the current limit value is set to the general limit value, and if the current current is greater than the set value, the current limit value is set to the brightness limit value.
Organic light emitting diode display device. In a method of operating an organic light emitting diode display device including a panel on which a plurality of pixels are arranged,
supplying current to the panel;
Implementing automatic current limit to control the current supplied to the panel below a preset current limit value;
detecting current supplied to the panel; and
comprising adjusting the current limit value based on the sensed current,
The step of adjusting the current limit value is,
calculating a cumulative current by adding up the difference between the current current supplied to the panel and a reference value based on the current information supplied to the panel;
Comparing the calculated accumulated current with at least one of a decrease condition value and an increase condition value;
Comprising the step of adjusting the current limit value to a general limit value or a luminance limit value smaller than the general limit value based on the comparison result.
Method of operation of an organic light emitting diode display device.

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